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VII. SUPPLEMENTARY
A. PI stage magnetic field
FIG. 11. Measured DC magnetic field produced by PI stage. Z is along the stage translation
direction.
The motor technology for the PI stage (voice coil) produces both DC and AC magnetic
fields. The DC magnetic field in three directions is measured by a magnetometer as shown
in Figure 11. The measured total magnetic field produced by the PI stage is around 250 mG
at a distance of 6 cm from atoms in the science cell. The magnetic field is zeroed near the
PGC cloud position by three pairs of Helmholtz coils and further suppression of magnetic
field by a factor of
10 is also achieved by shielding the PI stage with a mu-metal box, as
shown in dashed lines in Figure 11.